本文件规定了两种方法，用于确定由硫化橡胶或热塑性橡胶的测试件施加的反作用力的减小，所述测试件已经被压缩到恒定变形，然后经历温度循环。 方法A:在用于老化的高温和用于检查在该低温下的密封力的低温之间间隔循环温度。 方法B:温度在高温和低温之间连续循环，在试件中引入热应力。 通过连续测量系统确定反作用力。 本文件规定了两种形式的试件:圆柱形试件和环形试件。结果的比较仅在尺寸和形状相似的试件上进行时有效。 环形试件的使用特别适合于确定液体环境中的应力松弛。

This document specifies two methods for determining the decrease in counterforce exerted by a test piece of vulcanized or thermoplastic rubber which has been compressed to a constant deformation and then undergoes temperature cycling. Method A: The temperature is cycled at intervals between a high temperature for ageing and a low temperature for checking the sealing force at this low temperature. Method B: The temperature is cycled continuously between a high temperature and a low temperature to introduce thermal stress in the test piece. The counterforce is determined by means of a continuous-measurement system. Two forms of test pieces are specified in this document: cylindrical test pieces and rings. Comparison of results is valid only when made on test pieces of similar size and shape. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.